I read that, years ago, and it made absolute sense.
there is a way to PROVE what happened during the shooting. Many have tried this method but they have not corrected a few honest mistakes nor have they identified and removed the lies made to hide the truth. IF you were going to investigate the possibility that the US government was involved, would you use ANY of the evidence the conspirators in the government provided? Of course not but that is a fundamental mistake all of the authors make.
Once you know when Connally was shot in the back, you can know WHO was behind the murder with just a bit more work. It really is much easier than you'll believe until you prove it to yourself that the truth can be known. Don't take my word for anything, verify what you see and it will become clearer how easy it is to lie to Americans.